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Technology advancement has long been at the core of full-color LED  displays’ transformation, including external Pulse Width Modulation (External PWM). But as market demand for improved display quality continues to increase, technological innovations have resulted in Scrambled PWM (S-PWM). We will discuss its many differences from traditional PWM technology.

What are Traditional PWM controls?

Prior to now, full-color LED screens utilized traditional LED driver chips with external controllers that controlled each LED’s conduction time individually using external Pulse Width Modulation (External PWM) for brightness adjustments. This process was often known by its acronym of External Pulse Width Modulation or simply PWM for short.

Traditional PWM driver chips were equipped with PWM counters capable of counting at 25MHz and limited the maximum refresh rate to 360Hz; increasing counting frequency could only raise that limit up to 420Hz at best, making use of traditional PWM driver chips an arduous process that ultimately had limited results for image display.

Furthermore, it was imperative for PWM counter and LED current output response times to match each other; otherwise additional issues arose such as electromagnetic interference (EMI), overshoot or undershoot of LED current output response times.

What Is S-PWM?

Given the limitations posed by traditional PWM driver chips, they present significant obstacles. To address these difficulties and increase full-color LED display performance, S-PWM technology was created as the solution.

Scrambled PWM (S-PWM) technology seeks to augment traditional Pulse Width Modulation (PWM), by breaking an image’s conduction time down into multiple shorter periods in order to increase visual refresh rate and keep pixels updated faster than before. Simply stated, new LED driver chips equipped with S-PWM disperse counting each continuous display frame into multiple counts while maintaining its On/Off ratio in each segmented part of counting each continuous frame display frame continuously.

Traditional PWM Vs S-PWM Technology

S-PWM technology is widely viewed as one of the key contributors to improving full-color  LED screens, significantly increasing refresh rate while simultaneously eliminating flickering at lower brightness levels. Furthermore, 16-bit grayscale capability provides superior image processing that produces vibrant and realistic color representations.

BOE’s MLED SMD BRY series products leverage S-PWM technology for an outstanding refresh rate of >=3840Hz, effectively eliminating flickering at low brightness levels while improving grayscale transitions for an enhanced viewing experience. Furthermore, its improved brightness uniformity and color fidelity result in exceptional visual experiences for viewers.

S-PWM technology not only enhances display quality but also significantly lowers high-frequency electromagnetic interference (EMI), decreasing radiation exposure. This decrease in exposure helps lessen eye strain, dryness and discomfort caused by long term electromagnetic radiation levels; consequently minimizing human time and intensity exposure reduces health impacts caused by prolonged electromagnetic radiation levels.

Utilizing cutting-edge technological capabilities, BOE’s MLED SMD BRY products offer an immersive visual experience. Boasting new-generation ultra-thin integrated devices with hard connections and super thin three-in-one integrated assembly features.

Their product lineup, including large and small LED screen series, meets various user demands with its extensive product offering. Preloaded with brand integrated products to streamline installation efficiency. Incorporating 45 degree corner border switches for right-angle assembly. Finished off by an elegant die cast frame design for an unassuming and minimalistic appearance.

T-PWM technology’s impressive performance will become an industry trend going forward. BOE MLED will continue its commitment to technological development and business expansion by creating advanced S-PWM displays to further increase performance and quality while meeting user demands. Upholding its philosophy of innovation, quality, and user experience.


S-PWM technology has marked the dawn of an exciting era of  full-color LED displays by meeting traditional PWM’s limitations head on and revolutionized the industry by significantly improving technology and significantly decreasing electromagnetic interference – not only has its implementation led to improved image quality and user comfort and health benefits from reduced radiation exposure but its adoption has revolutionized industry standards as a whole.

S-PWM technology will continue to play an integral part in shaping the LED display industry in coming years, and companies like BOE MLED are leading this development forward by striving to offer their users superior visual experiences.